Question

Python Lesson Assignment

Implement the following 4 functions:

fancy_min(a, b)

Input: two formal parameters: a and b

Output: return the minimum of a and b

Notes:

• a and b can either be a number or None

• if a is None, return b

• if b is None, return a

• if both are None, return None

• otherwise return the minimum of a and b

• do not use the built in function min()

fancy_max(a, b)

Input: two formal parameters: a and b

Output: return the maximum of a and b

Notes:

• a and b can either be a number or None

• if a is None, return b

• if b is None, return a

• if both are None, return None

• otherwise return the maximum of a and b

• do not use the built in function max()

minimum_of(numbers)

Input: numbers is a list of numbers (an item inside numbers can be None as well)

Output: returns the minimum number in numbers.

Notes:

• minimum_of MUST use the function fancy_min

• you cannot use the Python min() function

• if numbers is empty, return None

• if numbers is None, return None

maximum_of(numbers)

Input: numbers is a list of numbers (an item inside numbers can be None as well)

Output: returns the maximum number in numbers. Notes:

• maximum_of MUST use the function fancy_max

• you cannot use the Python max() function

• if numbers is empty, return None

• if numbers is None, return None

In all cases, the value None is treated as an absence of a value so the other value always 'wins'.

All your code should go in lesson.py tab/module Use main.py to build your own tests.

Testing

Sometimes it's best to crash when code is not properly working. Python has an assert statement that you can use. The first parameter to assert is a boolean expression. If this boolean expression returns False, a runtime error will be generated. You can also pass a message to print if the assertion is thrown:

# no error will be generated if this passes assert 12 == lesson.minimum_of([12,24,48]), "expected 12"

assert lesson.fancy_min(None, 2) == 2, "should be 2"

assert lesson.fancy_min(2, None) == 2, "should be 2"

assert lesson.fancy_min(2, 3) == 2, "should be 2"

Answer 1

Please refer to screenshot

Code

Output

Code to copy

def fancy_min(a, b):
    if a is None: return b
  
    if b is None: return a
  
    if a < b: return a # if a is small
      
    return b # if b is small

def fancy_max(a, b):
    if a is None: return b
      
    if b is None: return a
      
    if a > b: return a # if a is greater
      
    return b # if b is greater
  
def minimum_of(numbers):
    res = None # initializing result
    for num in numbers:
        res = fancy_min(res, num) # getting minimum of res and next number
    return res
  
def maximum_of(numbers):
    res = None # initializing result
    for num in numbers:
        res = fancy_max(res, num) # getting maximum of res and next number
  
    return res
  
# driver code
def main():
    aList = [1, 4, 43, 22, 1223, None, 87, 234, None, 44]
    print("Maximum of aList is:", maximum_of(aList))
  
    print("Minimum of aList is:", minimum_of(aList))

main()